Grinding device



GRINDING DEVICE m afm/puny @ms sept 1s, 1945. M Hom 2,384,911

GRINDING DEVICE Filed Aug. 30, `1944 5 Sheets-Sheet 2 WWW sept. 18, 1945. 1 M. HLTZ 2,384,917

GRINDING DEVICE Filed Aug. 30, 1944 3 Sheets-Sheet 3 fl QD' Inventar Z/-H-O f TM/a fafa/fz OO 1 By mhma/Wuwy Hmm v accompanying drawings and claimed.

Patented Sept. 18, 1945 This invention relates to a grindingA deviceprimarily designed vfor attachment to latheshand ""h'as more particular reference to means if'or mounting a portablel grinder upon thetoollside of a lathe carriage` whereby said grinder `willlbeV supported in proper positionr for engagingA its grindingtool with the work. V

An important object of thepre'sent nventionlis to provide a device of the abovekind wherebytlie portable grinder is ,mounted for' swinging-movement about a vertical'-axis,v and whereinfmeans'is 5 provided to yieldingly swing the grinder in afilirection to engage its grindingtooifwith thework, ,under manual control anvdwith a predetermined pressure. i i

A further @brett 'or tireirresertt-rnvsrttltn ist@ l f provide a device of the above kind which is com- Darativ'ely simple and durable in construction, readily applicable to existing lathe carriages,'and

' highly efcient in operation.

The present invention consists, in the novel irma combinaaowndarrangement @para hereinafter more `fully described; shownlin Vthe `I n ,t e drawings, wherein llievreference characters indicate corresponding partslthroughout the several views: Q vFigure 1 is afragrnentary top planview illustrating a grinding attachment constructed inaccordance with the present invention and operatively mounted upon a latin'ecarriajge'.y

. i Figure 2 is a rear elevationa1'-uview thereowith the grinder omittedfor sake ofclearness Figures to 8 inclusivaare perspective Viewsof various parts ois-the ,mounting means for.. the

grinder.V t Y Y. 1

AFigure 9 is a fragmentary vertical section taken on theplane of line'S-{Sl of Figure 1 .Referring in detalto the drawings,the.i1lu s trated embodimentof the present device isprimarily designed for; use ,upon a .lathe carriage Whichlmayfbe of the type shown in the ILS, patent to A W, .Whitcornby No. 1,169,214, datedvJ anuary 25, 1916, and which consists ofacompound bed, a swivel blockt mountedon the bottom slide Land a tool slide 9 ,mounted 01,1 the swivel block 8.f Also, the present attachment makes useora -conventional portable ,grinderl I0 including Van electric, motor whose casing. provided atone endwith a reducedextensionil constitutinga housing fory the'armature shaft ofsaid motor,

andwhich armature shaftA has a projecting end equipped with a chuck I2 in whicnissecured the :shank I3. of agri'nding tool laofrfrusto-,concal form. l vv Y :A mount is provided for the portable grinder and includes a rectangular plate I5 having a centrai sperling i e throughwhlcncas'ses s pirateria n that is threaded into the toolslide-q seas to 'pivotally'lnount the plate 1 5 u pntheflattr for turningy movement about a vertical ainsi "A'f'uf- 'ther noie 'la maybe provided through trie plate' I 5 adjacent'the opening IB 'to facilitate 'reduction of a lubricant between the' enacting fades of the slide e and plate" 1 5 folpromoting easeof turning of the` latter;4 Y `secureuto opposite sides of the plate I5 arecireular split elamps 'It and 2t, respectively, said clamps havingvpiojectihg at tachlng arms 2l and 22, respectively; and screws arm'sZI and 2 2 and threaded into socket-*2426i the plate' Itro'r rigidly-'steering saiqftlamps to said plate l5. The' inner opening of' each arm 2'I and 22 is preferably elongated vertically,` as at 25, vso as to permit liii'lted v'i'tial jdllti'llntfof the clamps I9 andl relative to plateISL-:The elainp I9 is 'of "a size; to embrace tne'redced shaft housing portionn of tnercasingfofiinotor l0, while the clamp 2D is largero'r embracingttne main or b'ody'port'n of'tnelcasing of inotor- It. Screws 26 are provided to.tifglite"the clar'npsA I9 and 20 into nrrn 'gripping 'en gjagernent=` with .the casing portions of the motor 1 0` *for rigidly mounting the grinder upon and tothe 'inner sideiof the plate l5. The vertical adjustment fot clamps 19 and 2c maybe'ffc'ted bylset fscrewszT-camed by' the arms 2l and!! lnposition to'impinge the 'screws 23'V- tliat paSs'thi-ogh the long'atedfbpenings 'at 25, fsaidllatterserwsrbetrlg-rrierelyused f to hold'the arms 2i attainT against the' sldes'of jecting tow other ing' the carriage jthe plate l5 and Being. loosened when` the-set :l5Y

screws 21 are utilizedfor adjustmentf Y Attached at one end Atio the tool 'slidfbelow the plate I5 is a horizontal inwardly extending bar 28 that projects across th tool carriage to a point' beyond the clamps AI9 and 20; "Attached by 40 screws zato the outer or rfreeware of barzsis'a block" 30 having an operlingf` I'throilgliwlieh siidabl'y extends 'an adjusting screw 32 Thaving" 'a l block 5 0.' Attachedjat one end to tneinr'rer 'end base mounted vfor movement longitudinally oi Y.the 45 v4bed of thelathe upon ways E and including abettom slide I adjustable transversely ofA the lathe Voi'f'screw 32 isa helical tenslon'spring' SII'vwhse the arm 2| of clamp-fle. rtwilitlius besefte that tp turn platel 5 about' pivot-,teit I'I in a` direction tobauseswiiiging 4vof 1the'V claliis I9 and -20 vandA the'grinder 'carried -thijebi'so that the' grinding tool u 'is noveatranstersely of tne latte bed@ in 'a direction to engage said grinding tool withlthe work orV tap 3S Vfeet-i'- lorlgitndlnally ofthe lathe" bjeu AVtow rd said work or tap. "'Inpractice, th'tap i's preferably supported `in a horizontal l position pi-'- f ard thefiathefcariafge, by 'inans of a work Vsug'pport of the typesfhown infiny Cio-peildend is attachedby irreal-rs of a serewssto l.- In combination with The swinging movement of plate I and parts carried thereby is properly adjustably limited to limit the depth of cut of the tool i4, by means of an adjusting screw 3l lthreaded through a block 38 carried by thefinner side of bar 2B adjacent plate I5, lan end of screw 31 being disposed to abut the inner edge of plate l5 to one side of the pivot of the latter. Block 38 is secured to bar 28 `by screws 39. At the side opposite that to which bar 28 is attached, tool slide 9 is increased in effective width by attaching a block il!)V thereto arranged to directly underlie the adjacent end of plate I5. Block or plate 40 is attached to the tool slide 9 by means of screws 4| passing through openings l2` of said plate or block 4D. and threaded into the adjacent side of the tool slide 9.-

lThe device is used to grind a tap coincident .with its longitudinal flutes so as to increase the Width of the latter without materially increasing the depth of the same. In this Way, material is `removedfrom opposite sides of the lands or teeth 'of the tapto recondition the latter.

To do this, the-lathe` carriageis adjusted to bring the grinding tool beside a flute of the tap at the free end of the latter.

ltap and the operation is repeated for the full length of 'the flute. -Theother flutes of the tap are ground inthe same way, whereupon reconditioning'of the vtap is completed.

It'will be seen that spring 34swings the grinder 'and its mount in adirection to engage the grinding;- tooll i4 with the work under apredetermined pressure, 'depending upon the tension of spring '34, which may-'be varied as'required by turning thegnut 33-of .adjusting screw 32.` A construction is thus had for effectively carrying out the stated objects of the invention, and it is -believed that 'the construction, operation andA advantages of 'theinvention--will-be readily apparent to those skilled'in the art. Minor vchanges in details of construction illustrated and described are contemplated, such as fall within the spirit'and scope ofthe invention'asclaimed.` For instance,` the device may be incorporated in the construction of a special'grinding machineg'instead of beingl designed' as an Vattachment for conventional lathes; Y u

What Iiclaim is: f y

the tool slide of `a lathe carriage, Vand a portable-grinder, means to mount said-grinder upon said tool slide including a horizontal plate; meanspivotally mounting the plate uponthetool slide for turning movement about a'vertical axis, clamps rigidly attached to opposite-sides of said plate and projecting laterallyr therefrom, said clamps embracing the motor casing oil the grinder at spaced points, a bar attached at one end to one side of thetool slide and-projecting vtherefrom across the carriage and Vbeneath the-grinder beyond said clamps, and a vhelical tension spring attached at one end to the *free en dof saidbar and at itsother end to one of said clamps for yieldingly swinging said plate Yin'a direction to -move the grinder for causing yielding engagementof its grinding tool with the 2.- In combination with the tool slide of a lathe carriage, anda portable grinder, means to mount said grinder upon' said tool slide including a horizontal plate, means pivotally mounting said plate grinder beyond said clamps, and a helical tension spring attached at one end to the free end of said bar and at its other end to one of said clamps for yieldingly swinging said plate in a direction to move the grinder for causing yielding engagement of its grinding tool with the work, and means to regulate the tension of said spring.

3. In combination with the tool slide ofa lathe carriage, and a portable grinder, means to mount said grinder upon said tool slide including a horizontal plate, means pivotally mounting said plate upon the tool slide for turning movement about a vertical aXis, clamps rigidly attached to opposite sides of said plate andprojecting laterally therefrom, said clamps embracing the motor casing of the grinder at spaced points, a barattached at one end to one-side of thetool slide and projecting -therefrom across the carriage and beneathV the grinder beyond said clamps, and a helical tensionspring attached at one end to the free end of said bar and at its other end to one of ysaid clamps for yieldingly swinging said plate `in a directionl to move the grinder for causing yielding engagement of its grindingY tool with the work, and means toadjustably limit .turningr movement of said plate under the iniiuence of said spring.

4. In combination with the tool slide of alatbe carriage, and a portable grinder, means to mount said grinder upon said tool slide including a horizontal plate, means pivotally mounting said plate upon vtheftool slide for turning movement about a vertical axis, clamps rigidly attached to opposite sides of said plate and projecting laterally therefrom, said .clamps embracing the, motor `casingr of the grinder atspaced points, a bar attached at one end to oney side ofthe tool slide and projecting therefrom across the carriage and beneath the grinder beyond saidclamps, and a helical tension spring attached at one end .to the free end `of said bar and at its other end to one of said clamps for yieldingly swinging said plate in a direction to move the grinder for causing yielding engagement of its grindingrtool with the work, and means to adjustably limit turning movement Yofsaid plate under the influence of said spring,

`saidlast-named means comprising a block car- `a support, a horizontal plate. .means pivotally mounting said plate upon thesupport for turning movement abouta vertical axis, .clamps rigidly attached to opposite sides of said plate and projecting laterally therefrom, said clamps embracing the motor casing of the grinder at spaced points, a bar .attached at `one end to one side of the support and projecting therefrom beneath and beyond the grinderand the clamps, and a helical tension spring attached to one of the clamps and the free end oiv said bar for swinging the grinder about said axis to cause engagement of its grinding tool with the work. y

, LOUIS HOLTZ, 

